Build LWc component to Enter Email Id Once you entered the Email id, on the button(Search) pressed it will check whether the Email id exists in the contact, If email exists then it will display a message that the email id exists. if an email id not exis

Hai Omkar,

I have tried this, how Amey suggested. You can find the below code.

CMP.file

<template>
    <lightning-input label="Enter Email" onchange={handleemailvalue}></lightning-input><br>
    <lightning-button label="Search" onclick={handleCheck}></lightning-button>
</template>

Js.file

import { LightningElement,api,wire,track} from 'lwc';
import checkinContact from '@salesforce/apex/contactclass.checkinContact';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
export default class Fecthemail extends LightningElement {
    @api enteredEmail;
    handleemailvalue(event) {
        this.enteredEmail = event.detail.value;
    }
    handleCheck(){
        checkinContact({conEmail : this.enteredEmail})
        .then(result => {
            if(result === true){
                const event = new ShowToastEvent({
                    title: 'Contact Found',
                    message: 'Found contact with same Email',
                    variant: 'success'
                });
                this.dispatchEvent(event);
            }
            else{
                const event = new ShowToastEvent({
                title : 'Contact Not Found',
                message : 'Did not found contact with the email you have entered',
                variant : 'error'
            });
            this.dispatchEvent(event);
            }
        })   
    }   
}

   Apex Class:- 

public class contactclass {
    @AuraEnabled(Cacheable = true)
    public static Boolean checkinContact(string conEmail){
        Boolean bool = false;
        List<Contact> con = [SELECT id,Name,Email FROM Contact where Email =:conEmail];
        if(con.size()>0){
            bool = true;
        }
        else{
            bool = false;
        }
        system.debug(bool);
        return bool;   
    }  
}

If you found this is helpful, please make this answer correct. And also if anyone is interested to see some component development in lightning you can check my blog. 

https://viewonreview.com/

Thanks,

Mithun 

#Trailhead